Giantess Fionna's Diaper Punishment

(Image from diapermess.com)

Bryan had beaten Fionna to the point that she was incontinent and required diapers 24/7. He’d made her feel powerless and weak, but now she held the upper hand. 
She’d slipped the serum into his tea and watched him slowly become smaller and smaller until he was no taller than six inches. 
“Now it’s time for you to pay, you bastard.” She growled as she dangled him by the back of his jeans between her fingers.
“Please, Fionna.” He begged. “I’ll do anything.” 
“You should have thought of that earlier…” She spat, as she pulled open the back of her messy diaper and hovered him over the back of it. 
“Have fun in there.” She laughed, as she dropped him into the bottom of her messy, wet diaper to live out his solitary confinement.